Decagon is a 10 corner shaped diamond. 6 prongs won't make it symmetrical liao.
The decagon and their other white series have better light performance than the SIC. They look brighter for the same color grade. So their white series G color still look very white. Some of the bros commented on that too afew pages back.
JP's VS2 is safe. They don't take in black inclusions or durability problem ones on the surface. I think the F-G, VS1-VS2 is more than good enough liao. Unless you mentally want a more high spec diamond.